<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="box">1234</div>
</body>
</html>
<script src="js/jquery-1.10.1.js"></script>
<script>
    var oBox =document.getElementById("box");
    oBox.style.background = "yellow"
    $("#box").css("color","blue");
</script>